Onicon F-2600 Manual de usuario descargar pdf (Pagina 82)

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F-2600 & F-2700 Vortex Flow Meter Manual 02/15 - 0808-7 / 19204 Page 82

4.2.2 Menu Items

The following menu items are in the Output Menu and allow selection and control of the

Modbus communication protocol.

Address

When the Modbus protocol is selected, the Modbus address is equal to the user's

programmable device address if it is in the range 1…247 in accordance with the Modbus

specication. If the device address is zero or is greater than 247, then the Modbus address

is internally set to 1.

Comm Protocol

The Comm Protocol menu allows selection of “Modbus RTU Even,” “Modbus RTU Odd,”

or “Modbus RTU None2,” or “Modbus RTU None1,” (non-standard Modbus) with Even,

Odd and None referring to the parity selection. When even or odd parity is selected, the

unit is congured for 8 data bits, 1 parity bit and 1 stop bit; with no parity, the number of

stop bits is 1 (non-standard) or 2. When changing the protocol, the change is made as soon

as the Enter key is pressed.

Modbus Units

The Modbus Units menu is to control which units, where applicable, the meter’s variables

will be displayed in. Internal – (these are the base units of the meter, °F, psia, lbm/sec , ft3/

sec, Btu/sec , lbm/ft3 Display) – variables are displayed in user selected display unit.

Modbus Order

The byte order within registers and the order in which multiple registers containing

oating point or long integer data are transmitted may be changed with this menu item.

According to the Modbus specication, the most signicant byte of a register is transmitted

rst, followed by the least signicant byte. The Modbus specication does not prescribe

the order in which registers are transmitted when multiple registers represent values

longer than 16 bits. Using this menu item, the word order and byte order for oating point

and long integer values may be reversed to accommodate different Modbus operating

systems.

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Onicon F-2600 Manual de usuario Pagina 82